Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va danh, ban hanh
cac luc » cau luc, coc luc, cac nuoc
van cac » van hac, van cau, van bac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su xac » pu xac, su cac
doi ve » moi ve, doi va, noi ve
su sac » su sach, su cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) or (su xac)) ky lang xa hoi. hieu van cac luc ((va hanh) OR (va thanh)) doi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky lang xa hoi. hieu van cac luc ((va hanh) OR (va thanh)) doi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su xac)) ky lang xa hoi. hieu van cac luc ((va hanh) OR (va thanh)) doi ve triet".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su xac)) ky lang xa hoi. hieu van cac luc ((va hanh) OR (va thanh)) doi ve triet*.